js 将图片转换为base64编

将图片转换为Base64

function image2Base64(img) {
    var canvas = document.createElement("canvas");
    canvas.width = img.width;
    canvas.height = img.height;
    var ctx = canvas.getContext("2d");
    ctx.drawImage(img, 0, 0, img.width, img.height);
    var dataURL = canvas.toDataURL("image/png");
    return dataURL;
}

获取图片Base64编码

function getImgBase64(){
    var base64="";
    var img = new Image();
    img.src="img/test.jpg";
    img.onload=function(){
        base64 = image2Base64(img);
        alert(base64);
    }
}

getImgBase64();